Voice recognition technologies are widely applied to the general-purpose devices, such as car navigation systems or mobile phones. However, cognitive-loads of voice operations have not been discussed sufficiently. Since it is necessary to translate a command to a verbal phrase, cognitive-loads of voice operations for simple tasks may become higher than those of manual operations. In this study, we analyzed microsaccade rates to compare the cognitive-loads between voice and manual operations objectively. Subjects performed a parafoveal transition detection task of a geometry pattern in which they responded by their voice or mouse clicks. We also evaluated the task performances of simultaneously imposed an RSVP (Rapid Serial Visual Presentation) task to estimate effects on cognitive distractions. The results show that microsaccade rates increase synchronously with the timing of voice responses, and task performances of the RSVP task decline immediately after voice responses compared with the results of manual responses. These findings suggest that voice operations have an effect to disengage subjects' attention from visual targets, and this attentional disengagement might cause the cognitive distraction of gazing objects.
抄録全体を表示